Trad plays down debt before Qld budget

Queensland Treasurer Jackie Trad is expected to deliver a small surplus when she hands down her first budget but the state's debt continues to haunt the Labor government.

Ms Trad travelled to Brisbane's Ferny Grove State High School on Monday to announce a $250 million injection to build school buildings to accommodate growing student populations, with 17,000 more expected by 2020.

It comes on the back of announcements of infrastructure and health commitments in the lead up to Tuesday's budget, with the government putting most of its cards on the table early about how it will spend taxpayers' money.

The deputy premier, who replaced Curtis Pitt as treasurer after the 2017 state election, ruled out any further taxes or charges, after previously announcing four "luxury taxes" and a waste levy of $70 a tonne.

The taxes are for luxury car owners, foreign property investors and online bets, plus a new land tax category for an estimated 850 large holdings that don't include farms.

They're expected to bring in a combined $163.3 million a year over the next three years to pay down debt, due to hit $83 billion in four years.

Liberal National Party Leader Deb Frecklington said regular households would be hit hard by the new levies.